Also, if you were interested it might be cool to do a 'prequel' of sorts for this fight, where the Pater first came to Ramor. I have another Ramor character who is essentially a super-soldier, who with a squad of fluff troops could be ambushed by the Pater. Obviously as it's a prequel it wouldn't have gone well for the troops, though they may have managed to beat the Pater off and the current fight could be a week or so later, depending on how fast the Pater could heal.

Just an idea, I just think the Pater would be most entertaining to fight with a squad of relatively human soldiers, as I absolutely love the Aliens universe.